Lithium Ion Batteries in new versions of the touch controlers
I think it would be a great idea to use Lithium ion batteries in any new version of the touch controllers. It should be possible to get between 5 to 10 hours of play time between charges with lithium ion. it would be even better if there were a charging dock included to make charging less of a hassel like you get when usin say usb cables to charge a device.
Dave Smith commented
I love the cheap replaceable rechargeable AA batteries. You can also get Lithium ion AA batteries! Having a removable AA battery adds longevity and choice to the product lifespan.